Determination and significance of the Mn(II) Zero-Field Splitting (ZFS) interaction in the geochemistry of travertines |
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| Institution: | 1. Universidade Estadual do Norte Fluminense, Laboratório de Ciências Físicas, Av. Alberto Lamego, 2000, Campos dos Goytacazes 28013-602, RJ, Brazil;2. Universidade Estadual do Norte Fluminense, Laboratório de Estudos do Espaço Antrópico, Av. Alberto Lamego, 2000, Campos dos Goytacazes 28013-602, RJ, Brazil;3. Universidade de São Paulo, Museu de Arqueologia e Etnologia, Av. Almeida Prado, 1466, Cidade Universitária, São Paulo 05508-070, SP, Brazil |
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| Abstract: | An analytical approach, based on the electron paramagnetic resonance (EPR) spectroscopy of Mn(II) in travertines, has been developed in order to obtain relevant information about the local inhomogeneity of calcite and about the thermodynamic conditions which control the formation of travertine deposits. This information is crucial to constrain the precipitation of travertine under different geochemical contexts. An empirical correlation between the spectral features and the zero-field splitting (ZFS) interaction has been established through numerical simulations of EPR spectra. The variability of the investigated parameters and the applicability of the method have been tested on several travertines from Central Italy. |
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